7. Press the power button on the rear of the device to turn the device
ON, and allow it to warm up.
Calibrate the Battery
If the battery is in need of fuel gauge recalibration, the red LED on the charger will flash upon insertion of the
battery. This indicator provides feedback to the user on the accuracy of the fuel gauge and avoids unnecessary
battery calibration cycles.
The user has the option to calibrate the fuel gauge and charge the battery, or to only charge the battery. This
option is given because a recalibration cycle is longer than a charge cycle and it may not be convenient to go
through the calibration cycle.
To recalibrate the battery, press the Calibrate button on the front of the charger. No action is required if only a
recharge is required, as the charger will automatically begin to charge the battery.
The blue calibration LED will flash to indicate that the battery is undergoing the recalibration cycle. There may be
a short delay before the calibration begins. During calibration the discharge resistors will heat up and the fan will
operate to maintain temperature within acceptable limits. Removing the battery and/or pressing the calibration
button again will restart the process from the beginning.
At the end of this procedure the blue LED will stay constant indicating a fully charged, fully calibrated battery.
The most common cause of calibration failure is overheating of the pack during discharge. Keep the charger
away from direct sunlight or heat sources.
Battery Notes
What is recalibration and why is it needed?
The fuel gauge in the battery uses a highly accurate voltmeter, ammeter, and time clock to measure actual charge
in and out of the battery pack. In addition, there are algorithms to compensate for the effects of discharge rate,
discharge temperature, self-discharge and charging efficiency, and so on.
Recalibration is the means to ensure the continued reliability of this device throughout the life of the battery pack.
Recalibration is used to reset the fuel gauge algorithms, reestablish the full and empty points, and recalculate the
actual capacity in the battery. In this way, even as the battery ages and things change, the accuracy and reliability
of the fuel gauge can be retained throughout the life of the battery.
The charger will automatically take the batteries through this process and is a useful alternative, ensuring
accuracy and reliability of the fuel gauge throughout the life of the battery.
Recalibration consists of a calibration charge, followed by a calibration discharge. Finally the battery is given a
regular charge. A calibration cycle will be faster if the battery is fully charged to begin with. Recalibration time for
the device main battery could be up to 14 hours.
CHAPTER 7 │User's Guide
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Rapiscan Systems Proprietary and Confidential
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